Grinding attachment for lathes



y 1945. R. A. SCHRAMM GRINDING ATTACHMENT FOR LATHES Filed March 13,1944 od siafidqw (NIL: u m Q M Q H ==W @x M Patented July 1 0, 1945 v IGR I'NDING.AErTAcnMEnrFoRLArnEs 3 Roy A. Schrarnm,f Bay City, :Mich;assignor of 7' a fort Pct. cent to Earl S. Johnson, Bay City,

Mich.

. Application March 13, 1944, serial No. 5261145 v .6 Claims.(01.514259) -This invention relates to grinding attachments .for surfacegrinding and more specifically to an connection with conven-' attachmentfor use in tionallathes; I ne of the prime; objects ofthejinventionis toprovide an economical and practical grinding attachment for mounting ona conventional lathe, eliminating the necessity .of the shop ownerpurchasing an individual grinder'with drive. with fittings, thus makingpossible jthe accomplishment-of lathe work and surface grinding with aminimum investment in equipment conserving floor: space, and alsoproviding an' attachment from which the grinding wheel and drive can beremoved asa unit for'hand grinding operations when desired.-

- 3 Referring now" more particularlyto the drawingin whichIhave shownthe preferred embodie ment of my invention, :the letterjFB" indicatesa'structuraLi preferably welded, bracket support on which the attachmentismounted, this comprises ahorizontally disposed guide barltermieAnotherobject is to provide an attachment whichcan be quickly andeasilymountedon the bed plateof the lathe so thatthe, Work'may bereciprocated by the lathe, and the cross slide 01:)- erated in theconventional mannerfor evenly and-accurately grinding the work. I .Afurtherobject still is to'provide a grinding attachment including meansfor verticallyf'and longitudinally adjusting the grinding member withrelati0n to the work as wellas a scale for facilitating the setting ofthe tool.

Still; a-further objectisto provide a'slmpleand substantial supportingframe which can be easily mounted and/or removed fromthelathe bedi- "Astillfurther objectis to provide a, grinding attachment which is readilyadjustable to the conventional lathe at present in general useas well asto new lathesin the process of manufacture.

with theabove and other objects inview, the present invention consistsin the combination and arrangement of parts, hereinafter more fullydescribed, illustrated in the accompanying drawing and more particularlypointed out in'the appended claims, it being understood that changes maybe made in the form, size, proportion, and minor details ofconstruction. without departing from the spirit, or sacrificing any ofthe advantages of the invention.

In the drawing: Fig'. 1 is a front elevational view of the conventionallathe showing my grinding attachment in place thereon;

Fig. 2 is an end elevational view of the grinding attachment taken onthe line 2--2 of Fig. 1;

Fig. 3 is an end elevational view of the bracket support; and v Fig. 4is a fragmentaryfront elevational view showing a modified construction.

nat'ing in end members. 8 having 'base sections 9 asshown, and angularlydisposedbrace-members Ill-are welded in position to ireinforcelthestructure. A bar I I is' inserted beneath the'ways I 2 of the lathe bedL, and openings l3 are pro-' vided in themembers 9 and II respectivelyto accommodate bolts 14 to rigidly clamp the base to thelathe bed. f- Iv E'I'hegrinding attachment proper is mounted on the guide bar 1 andcomprises a bracket b5 suite ably groovedas at IE to slidablyaccommodate 7 .thr'guide bar, and a face plate 11 fits over said groove:and is heldin position by means of ,set screwsl8-in the usual mannen. v1

Vertically disposed guide rods l9 are s'lidably mounted in thebracket-|5 and a split'bearing 291is provided on the lower end thereof,said .bearev ing being secured in assembled. relation by means Aninternally threaded opening 22 is provided inthe bracket l5 between theguide rods. l9,"and

a threaded screw member 23 is threaded therethroughywith the lower endrevolvably secured to the .bearing '20; the upper end extendingthroughthe cross} member 24 which secures the "upper endsof the guiderods together. I

- Ahand wheel 25 is provided on the uppergend ofithe'scre'w 23* an'djahandle 26 projectstherefrom to provide for easy rmanipulationxof thewheel; the lower hub section of the wheel; being suitably graduated asat 21, and an indicator 28 is mounted on the member 24 to facilitate thesetting of the tool.

A; horizontally disposed shaft 29 is mounted in the bearing 20, and agrinding wheel 30 is secured thereon in the conventional manner, ahooded section 3| forming a cover for the grinding wheel, and can beformed integral with or bolted to the bearing [5 as desired.

The shaft 28 is suitably connected to the drive shaft of the motor 33,this motor being of conventional-design, and connecting wires 34lead toa suitable source of electric current supply.

The-attachment is longitudinallyadjustable I on the bar 1 and is held inadjusted position by I 1 means of a set screw 35 which is threaded inthe bracket-l 5, and it will be obvious that manipulation o f the handwheel 25 will raise or lower the grinding wheel as desired.

In Fig. 4 of the drawing I have shown a slightly modified construction,the only difference being that a motor 38 is adjustably mounted on theguide bar 1 and a sheave (not shown) is provided on the shaft 29, a belt39 serving to drivingly cona grinding wheel shaft j ournaled in saidbearing,

an abrasive wheel mounted on said shaft, and an individual driving unitconnected direct .to said shaft so that the grinding wheel, shaft, anddrive member can be disconnected as a unit.

4. A grinding attachment for lathes comprising, a rigid bracket supportsecurely and detachably mounted on the lathe bed, said support includingspaced apart substantially V-shaped end frames with a guide barconnecting the upper ends of said end frames, a bracket mounted on theguide bar and adjustable longitudinally thereon, vertically adjustablemeans slidably mounted in said bracket and having a bearing on the lowerend nect said motor and the drive shaft 29 on which the grinding wheel30 is mounted.

The grinding wheel and motor are readily removable as a unit, so that itcan be used as a hand grinding tool when desired, it being merelynecessary to unscrew the boltsZl and the motor and grinding'wheel willbe free. I

From the foregoing description it will be obvious that I have perfecteda very simple, practical and ,economical hand grinding attachment forlathes which can also be used as a hand tool when desired. 1

' What I claim is:

1. -A grinding attachment for lathes comprising, spaced apart end framesdetachably secured to the face of a lathe bed, a rigid guide barconnecting the upper ends of the end frames a bracket mounted on theguide bar and adjustable longitudinally thereon, a grinding wheelassembly mounted on said bracket, and means for vertically adjustingsaid wheel assembly.

2. A surface grinding attachment for lathes comprising,-spaced apart endframes detachably secured to the lathe bed a horizontally disposed guidebar, rigidly connecting the upper ends of said end frames a bracketmounted on said bar and longitudinally adjustable thereon, verticallyadjustable guides slidably mounted in said bracket, a bearing on thelower end of the guides,

a shaft journaled therein, a grinding wheel on the shaft, and a motordrivin gly connected to said shaft.

3. A grinding attachment for lathes comprising, spaced apart end framesadapted to be rigidly and detachably secured to a lathe bed, ahorizontally disposed guide .bar connecting the upper ends of saidframes, a bracket mounted for longitudinal adjustment on said bar,vertical guide rods slidably mounted in said bracket, a split bearingsecured to the lower end of said rods,

thereof; a grinding wheel shaft journaled therein, a grinding wheelmounted on the shaft, and a threaded adjusting member mounted in saidbracket and operable to vertically adjust said grinding wheel withrelation to the lathe bed.

5. A grinding attachment for lathes comprising, a rigidbracket supportsecurely mounted on the lathe bed, and comprising spaced apart endframes witha guide bar rigidly connecting said end frames, a bracketmounted on the guide bar and adjustable longitudinally thereon,vertically adjustable guide bars slidably mounted in said bracket andprovided with a bearing on the lower end thereof, a removable grindingwheel'asse'mbly journaledin said bearing, a threaded adjusting membermounted in said bracket for vertically adjusting said assembly, a handwheel on said threaded member, graduations on the hub thereof, and meansfor securing said adjusting member in adjusted position.

6. The combination with a lathe, of a table mounted on the cross slideof the lathe and onwhich the work is mounted, a rigid bracket supportmounted on the lathe bed and comprising spaced apart endframes spanningsaid table, and a guide bar rigidly connecting said end frames, a barbeneath the lathe bed, securing means engageable with said frame and barfor securing the frames to said lathe bed, a bracket mounted on theguide bar and adjustable longitudinally thereon, vertically adjustablemeans slidably mounted in said bracket and provided with a bearing onthe lower end thereof, a removable grinding wheel assembly journaled insaid bearing, a threaded adjusting member mounted in said bracket forvertically adjusting said assembly and grinding wheel towards and awayfrom said table, a hand wheel on said threaded member, graduations onthe hub thereof, and means for securing said adjusting member inadjusted position.

ROY A; SCHRAMM.

